Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes form a random pattern.


Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes

Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that

Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds' tubes

Unlike mammals, in whom the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, the tubes in birds

Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes

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题目分析：
在(A)(B)中具有平行制造者whereas；(C)(D)(E)具有比较词unlike，其连接的两者需要在逻辑上可比。

选项分析：

A选项：Correct. 本选项在语法和逻辑上均是正确的。

B选项：本选项在语法上没有问题。但在逻辑上有两处错误。
第一，whereas连接的两个句子在逻辑上并不具有对比关系，前半句为：“在哺乳动物中，血管是平行排列的”，后半句为：“鸟类也有血管”（birds have tubes）。后半句应该改为：“在鸟类中，血管是随机排列的”（the tubes form pattern）。
第二，介词短语 for the conveying of nutrients to bone cells应改为定语从句。这是因为，介词for身后是动名词短语，动名词是没有在语法上的逻辑主语的，例如，我们说，a bag for sleeping，这个词的意思是，睡袋。这完全不等同于a bag that sleeps（一个bag没法睡觉）。在本题语境下，tiny tubes必须是发出convey这个动作的施动者。

C选项：unlike连接两者比较对象不对等，不能用“哺乳动物”和“鸟类的血管”相比较；for the conveying of nutrients to bone cells错误同(B)。

D选项：本选项错误同(C)。

E选项：定语从句which in mammals are arrayed in parallel lines具有就近修饰原则，在语法上就近修饰bone cells，这在逻辑上是不对的，are arrayed in parallel lines的逻辑主语为the tiny tubes。

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